projects / rustc.git / blame
| Commit | Line | Data |
|---|---|---|
| 74b04a01 XL |
1 | // Check that we expand multiple or-patterns from left to right. |
| 2 | ||
| 3 | // run-pass | |
| 4 | ||
| 5 | #![feature(or_patterns)] | |
| 74b04a01 XL |
6 | |
| 7 | fn search(target: (bool, bool, bool)) -> u32 { | |
| 8 | let x = ((false, true), (false, true), (false, true)); | |
| 9 | let mut guard_count = 0; | |
| 10 | match x { | |
| 11 | ((a, _) | (_, a), (b @ _, _) | (_, b @ _), (c @ false, _) | (_, c @ true)) | |
| 12 | if { | |
| 13 | guard_count += 1; | |
| 14 | (a, b, c) == target | |
| 15 | } => | |
| 16 | { | |
| 17 | guard_count | |
| 18 | } | |
| 19 | _ => unreachable!(), | |
| 20 | } | |
| 21 | } | |
| 22 | ||
| 23 | // Equivalent to the above code, but hopefully easier to understand. | |
| 24 | fn search_old_style(target: (bool, bool, bool)) -> u32 { | |
| 25 | let x = ((false, true), (false, true), (false, true)); | |
| 26 | let mut guard_count = 0; | |
| 27 | match x { | |
| 28 | ((a, _), (b @ _, _), (c @ false, _)) | |
| 29 | | ((a, _), (b @ _, _), (_, c @ true)) | |
| 30 | | ((a, _), (_, b @ _), (c @ false, _)) | |
| 31 | | ((a, _), (_, b @ _), (_, c @ true)) | |
| 32 | | ((_, a), (b @ _, _), (c @ false, _)) | |
| 33 | | ((_, a), (b @ _, _), (_, c @ true)) | |
| 34 | | ((_, a), (_, b @ _), (c @ false, _)) | |
| 35 | | ((_, a), (_, b @ _), (_, c @ true)) | |
| 36 | if { | |
| 37 | guard_count += 1; | |
| 38 | (a, b, c) == target | |
| 39 | } => | |
| 40 | { | |
| 41 | guard_count | |
| 42 | } | |
| 43 | _ => unreachable!(), | |
| 44 | } | |
| 45 | } | |
| 46 | ||
| 47 | fn main() { | |
| 48 | assert_eq!(search((false, false, false)), 1); | |
| 49 | assert_eq!(search((false, false, true)), 2); | |
| 50 | assert_eq!(search((false, true, false)), 3); | |
| 51 | assert_eq!(search((false, true, true)), 4); | |
| 52 | assert_eq!(search((true, false, false)), 5); | |
| 53 | assert_eq!(search((true, false, true)), 6); | |
| 54 | assert_eq!(search((true, true, false)), 7); | |
| 55 | assert_eq!(search((true, true, true)), 8); | |
| 56 | ||
| 57 | assert_eq!(search_old_style((false, false, false)), 1); | |
| 58 | assert_eq!(search_old_style((false, false, true)), 2); | |
| 59 | assert_eq!(search_old_style((false, true, false)), 3); | |
| 60 | assert_eq!(search_old_style((false, true, true)), 4); | |
| 61 | assert_eq!(search_old_style((true, false, false)), 5); | |
| 62 | assert_eq!(search_old_style((true, false, true)), 6); | |
| 63 | assert_eq!(search_old_style((true, true, false)), 7); | |
| 64 | assert_eq!(search_old_style((true, true, true)), 8); | |
| 65 | } |